Table of Contents

10BaseT/100BaseTX Switched Uplink Module

10/100 Module Port Status LED
10/100 Module Port Duplex Mode LED
10/100 Module Port Speed LED

100BaseFX Switched Uplink Module

100BaseFX Module Port Status LED
100BaseFX Module Port Duplex Mode LED

Installing a Module
Removing a Module
Connecting to the Module Port
Troubleshooting
Technical Specifications

Switched Uplink Modules

When installed in a FastHub 400 model, each 10BaseT/100BaseTX and 100BaseFX switched uplink module provides a separate switched collision domain for traffic to the workgroup backbone.

10BaseT/100BaseTX Switched Uplink Module

The 10BaseT/100BaseTX switched uplink module, hereafter referred to as the 10/100 switch module, has a switched 10/100 autosensing port (Figure D-1). By default, the port autonegotiates the transmission speed and duplex mode. You can set the port to
10 or 100 Mbps and to half- or full-duplex mode.

The 10/100 switch module has LEDs (STAT, DUP, and 100) that reflect the status, duplex mode, and speed of the module port. These LEDs are described later in this section.

Figure D-1: 10BaseT/100BaseTX Switch Module

The 10/100 switch module complies with IEEE 802.3 10BaseT and IEEE 802.3u 100BaseT standards. The port uses a standard RJ-45 connector. Attached devices must be within 100  meters of the port and be either 10BaseT- or 100BaseTX-compatible. (See the "10/100 Ports" section for details on the port connector.)

10/100 Module Port Status LED

The colors of the STAT LED show the status of the module port (Table D-1).

Table D-1: 10/100 Module Port STAT LED Description

Color	Status
Off	No link.
Solid green	10BaseT or 100BaseTX link operational.
Flashing green	10BaseT or 100BaseTX link operational (with activity).

10/100 Module Port Duplex Mode LED

The colors of the DUP LED show that the module port is operating in either half- or full-duplex mode (Table D-2).

Table D-2: 10/100 Module Port DUP LED Description

Color	Status
Off	Operating in half-duplex mode.
Solid green	Operating in full-duplex mode.

10/100 Module Port Speed LED

The colors of the 100 LED show that the module port is operating in either 10 or 100 Mbps (Table D-3).

Table D-3: 10/100 Module Port 100 LED Description

Color	Status
Off	Operating at 10 Mbps.
Solid green	Operating at 100 Mbps.

100BaseFX Switched Uplink Module

The 100BaseFX switched uplink module, hereafter referred to as the 100BaseFX switch module, has a switched 100BaseFX port for 100-Mbps fiber-optic connectivity (Figure D-2). By default, the port operates in half-duplex mode. However, you can set the port to full-duplex operation.

The 100BaseFX switch module has LEDs (LINK and DUP) that reflect the status and duplex mode of the module port. These LEDs are described later in this section.

Figure D-2: 100BaseFX Switch Module

100BaseFX Module Port Status LED

The colors of the LINK LED show the status of the module port (Table D-4).

Table D-4: 100BaseFX Module Port LINK LED Description

Color	Status
Off	No link.
Solid green	100BaseFX link operational.
Flashing green	100BaseFX link operational (with activity).

100BaseFX Module Port Duplex Mode LED

The colors of the DUP LED show that the module port is operating in either half- or full-duplex mode (Table D-5).

Table D-5: 10BaseFX Module Port DUP LED Description

Color	Status
Off	Operating in half-duplex mode.
Solid green	Operating in full-duplex mode.

Installing a Module

You can install either switched uplink module in the expansion slot on the rear panel of the hub.

Warning Class 1 laser product.

Warning Avoid exposure to the laser beam.

Caution When installing a 100BaseFX switched uplink module, do not remove the rubber plugs from the fiber-optic port or the rubber caps from the fiber-optic cable until you are ready to connect the cable. The plugs and caps protect the fiber-optic port and cable from contamination.

Caution The modules are not hot-swappable. Be sure to power off the hub before installing a module in the hub or removing it.

To install a module, follow these steps:

Step 1 Power off the hub.

Step 2 Remove and set aside the screws attaching the faceplate to the expansion slot. The screws will be used later in Step 6.

Step 3 Remove the faceplate and store it for future use.

Step 4 Slide the module into the slot card-guides until you feel it touch the back of the hub.

Step 5 Push the module firmly until it snaps into place and is firmly seated. Figure D-3 shows a 10/100 switch module being installed.

Figure D-3: Installing a Module

Step 8 Connect the module port to a device as described in the "Connecting to the Module Port" section.

Removing a Module

Caution The modules are not hot-swappable. Be sure to power off the hub before installing a module in the hub or removing it.

To remove a module, follow these steps:

Step 1 Power off the hub.

Step 2 Disconnect the cable from the module port.

Step 3 Loosen the screws attaching the module to the hub.

Step 4 Pull the module out of the slot.

Step 5 Replace the blank faceplate over the slot.

Step 6 Insert and tighten the screws on the faceplate.

Step 7 Power on the hub.

Connecting to the Module Port

Warning Class 1 laser product.

Warning Avoid exposure to the laser beam.

Caution When installing a 100BaseFX switched uplink module, do not remove the rubber plugs from the fiber-optic port or the rubber caps from the fiber-optic cable until you are ready to connect the cable. The plugs and caps protect the fiber-optic port and cable from contamination.

Insert a connector according to the type of module (10/100 or 100BaseFX), as follows:

• 10BaseT/100BaseTX connector---Insert the connector until it snaps into place in the module port (see Figure D-4).

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Note Use a straight-through cable to connect two ports when one of the ports is designated with an X. Use a crossover cable to connect two ports when both ports are designated with an X.

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Figure D-4: Connecting to the 10/100 Module Port

• 100BaseFX SC connector---Remove the rubber plugs from the fiber-optic port on the module and store them for future use. Insert the connector into the fiber-optic module port (see Figure D-5).

Figure D-5: Connecting to the 100BaseFX Module Port

Troubleshooting

Use Table D-6 to identify problems with the modules and take the appropriate corrective action.

Table D-6: Common Problems and Their Solutions

Symptom	Possible Cause	Corrective Action
Poor performance or no links	Incorrect speed settings for 10-Mbps and 100-Mbps connections.	Let both ports autonegotiate port speed. Set the port speed to match on both ends of the connection.
	Cabling distance exceeded. Port statistics show excessive FCS, late-collision, or alignment errors. For 100BaseTX connections: The distance between the port and the attached device exceeds 100 meters. If attached to a repeater, the total distance between the two end stations exceeds the 100BaseT cabling guidelines. For 10BaseT connections: The distance between the port and the attached device exceeds 100 meters.	Reduce the cable length to within the recommended distances. See your 100BaseT repeater documentation for cabling guidelines. Reduce the cable length to within the recommended distances.
	Bad adapter in attached device. Excessive errors found in port statistics.	Run the adapter card diagnostic utility.
	Module was not correctly installed.	Ensure the module is firmly in place in the expansion slot and the screws are inserted and tightened.
Excessive flooding of unicast packets to the switched uplink module	Switched uplink module might have reached the maximum 1536  MAC addresses in memory and needs to be cleared.	Reset the installed switched uplink module to clear the address table.
No connectivity	Incorrect or bad cable. A crossover cable was used when straight-through was required, or vice-versa. Bad cable.	See "Connector and Cable Specifications," for the correct pinouts and the proper use of crossover vs. straight-through cables. Replace with a known good cable.
Port LED off	Devices not powered up.	Ensure both devices have power.
	Cable connection loose.	Verify the connection at both ends of cable.
	Wrong cable type.	Verify the cable type (crossover vs. straight-through).
	Incorrect wiring.	See "Connector and Cable Specifications," for pinout information.
	Faulty cable.	Replace the cable with a known good one.
Port LED solid amber	Port not forwarding. The port might be disabled by management, or the device at other end is malfunctioning.	Enable the port through in-band or out-of-band management. Investigate the device that is connected to the disabled port on the hub.

Technical Specifications

Table D-7 provides the technical specifications for the switched uplink modules.

Posted: Wed Feb 24 10:57:28 PST 1999
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